Figure 4. Acidic (left), neutral (middle) and alkaline 5-ASA solution under UV light (λ = 365 nm). (Photographs: Ducci)

From

Diazotype – A Historical Copying Process

Matthias Ducci

World Journal of Chemical Education. 2021, 9(4), 136-143 doi:10.12691/wjce-9-4-6